Abstract: A tool kit for adjusting the dimensions of dovetail slots and tongues for forming joints in slide fitting parts of an article of furniture comprises at least one block having a strip-like abrasive surface sized to contact only a side wall of a slot or tongue. The block has a sliding guide surface transverse to the abrasive surface for sliding engagement with a surface of the part to be finished as the abrasive surface is rubbed against the side wall. Two different blocks may be provided, one designed for adjusting slot dimensions and the other designed for adjusting tongue dimensions.